What have I done there again

I was just about to call it a day, my boss has long since left, when a man storms into the office. When I explain to him that he won't be getting an appointment today, he's pretty crushed. I come up with an idea that I know is absolutely no good and could even get me fired if anyone catches me doing it. But I'm all alone in the office, alone with this man who looks at me questioningly. I finally have to get over my shadow! I briefly explain to him what I'm up to and after an initially puzzled look, his grin widens! We go to the roof terrace next to my boss's office and he opens his trousers. Wow, maybe my job isn't so bad after all!